The canonical algebras (with an appendix by W. Crawley-Boevey)
In: Topics in Algebra. 1: Rings and representations of algebras, Jg. 26,1, S. 407-4321990
The dimension of a quasi-hereditary algebra
In: Topics in Algebra. 1: Rings and representations of algebras, Jg. 26,1, S. 263-2711990Hall algebras
In: Topics in Algebra. 1: Rings and representations of algebras, Jg. 26,1, S. 433-4471990